After you upgrade vRealize Automation, a system administrator upgrades the IaaS server components, including the Microsoft SQL Server database.
You have two options for upgrading the IaaS server components.
Use the automated IaaS upgrade shell script.
Use the vRealize Automation 7.3 IaaS installer executable file.
If you have a Common Components Catalog component installed, you must uninstall the component before you upgrade. After you finish the upgrade, you can reinstall the component with the appropriate version. For more information, see the Common Components Catalog Installation Guide. If this guide is unavailable, use the alternative procedure in Checklist for Upgrading vRealize Automation 6.2.5 to 7.3.